Journal
RSC ADVANCES
Volume 3, Issue 23, Pages 8766-8776Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra40639c
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Funding
- National Natural Science Foundation of China [61274018, 21174064, 21171098]
- National Basic Research Program of China (973 Program) [2009CB930601, 2012CB933300]
- Ministry of Education of China [IRT1148]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [10KJB430010]
- Natural Science Foundation of Jiangsu Province of China [BK2012835]
- Nanjing University of Posts and Telecommunications [NY211003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Program for Postgraduates Research Innovation of Colleges and Universities in Jiangsu Province [CXZZ11_0411]
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In the present study, we explored a novel design strategy of heteronuclear phosphorescent iridium(III) complexes chelated by BF2 moiety with 3-hydroxypicolinic acid as the chelate ligand and synthesized a new series of iridium(III) complexes [Ir(dfppy)(2)(hpa)BF2] (1b), [Ir(ppy)(2)(hpa)BF2] (2b) and [Ir(tpq)(2)(hpa)BF2] (3b) (hpa = 3-hydroxypicolinic acid, dfppy = 2-(2,4-difluorophenyl) pyridine, ppy = 2-phenylpyridine, tpq = 2-(thiophen-2-yl) quinoline) under mild conditions. The emission colors and wavelengths of iridium(III) complexes can be affected evidently by chelating BF2 moiety into iridium(III) complexes, and this effect will be changed with the difference of cyclometalating C boolean AND N ligands. A combination of UV-vis absorption, photoluminescence, excited-state lifetime measurements and theoretical calculations has provided the significant insight into the nature of the excited state and photophysical properties of these interesting iridium(III) complexes. Moreover, the exclusive staining of cytoplasm and low cytotoxicity were demonstrated for these new iridium(III) complexes, which made them promising candidates as multi-color phosphorescent dyes for living cell imaging.
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